Sixty years after she rolled off the Tupolev production line, OK-LDC nowadays does sterling service as a border marker and restaurant by the side of the old post road from Dresden to Prague. Far from any airdrome, tucked away in the hills which separate Saxony from Bohemia, this splendid piece of aviation history looks strangely out of place in the Czech village of Petrovice, just a few hundred metres from the border with Germany.